(220 ILCS 5/9-107)
    Sec. 9-107. Revenue balancing adjustments.
    (a) In this Section:
    "Reconciliation period" means a period beginning with the January monthly billing period and extending through the December monthly billing period.
    "Rate case reconciliation revenue requirement" means the final distribution revenue requirement or requirements approved by the Commission in the utility's rate case or formula rate proceeding to set the rates initially applicable in the relevant reconciliation period after the conclusion of the period. In the event the Commission has approved more than one revenue requirement for the reconciliation period, the amount of rate case revenue under each approved revenue requirement shall be prorated based upon the number of days under which each revenue requirement was in effect.
    (b) If an electric utility has a performance-based formula rate in effect under Section 16-108.5, then the utility shall be permitted to revise the formula rate and schedules to reduce the 50 basis point values to zero that would otherwise apply under paragraph (5) of subsection (c) of Section 16-108.5. Such revision and reduction shall apply beginning with the reconciliation conducted for the 2017 calendar year.
    If the utility no longer has a performance-based formula in effect under Section 16-108.5, then the utility shall be permitted to implement the revenue balancing adjustment tariff described in subsection (c) of this Section.
    (c) An electric utility that is authorized under subsection (b) of this Section to implement a revenue balancing adjustment tariff may file the tariff for the purpose of preventing undercollections or overcollections of distribution revenues as compared to the revenue requirement or requirements approved by the Commission on which the rates giving rise to those revenues were based. The tariff shall calculate an annual adjustment that reflects any difference between the actual delivery service revenue billed for services provided during the relevant reconciliation period and the rate case reconciliation revenue requirement for the relevant reconciliation period and shall set forth the reconciliation categories or classes, or a combination of both, in a manner determined at the utility's discretion.
    (d) A utility that elects to file the tariff authorized by this Section shall file the tariff outside the context of a general rate case or formula rate proceeding, and the Commission shall, after notice and hearing, approve the tariff or approve with modification no later than 120 days after the utility files the tariff, and the tariff shall remain in effect at the discretion of the utility. The tariff shall also require that the electric utility submit an annual revenue balancing reconciliation report to the Commission reflecting the difference between the actual delivery service revenue and rate case revenue for the applicable reconciliation and identifying the charges or credits to be applied thereafter. The annual revenue balancing reconciliation report shall be filed with the Commission no later than March 20 of the year following a reconciliation period. The Commission may initiate a review of the revenue balancing reconciliation report each year to determine if any subsequent adjustment is necessary to align actual delivery service revenue and rate case revenue. In the event the Commission elects to initiate such review, the Commission shall, after notice and hearing, enter an order approving, or approving as modified, such revenue balancing reconciliation report no later than 120 days after the utility files its report with the Commission. If the Commission does not initiate such review, the revenue balancing reconciliation report and the identified charges or credits shall be deemed accepted and approved 120 days after the utility files the report and shall not be subject to review in any other proceeding.
(Source: P.A. 99-906, eff. 6-1-17.)